UEFI based systems incorporating a Synopsys Designware PCIe controller
in RC mode will typically configure it before entering the OS. If this
configuration is fully static and ECAM compliant, there is no need to
expose particulars of the device to the OS, and we can simply describe
it as "pci-host-ecam-generic".
However, the Synopsys IP may be synthesized in a way where a quirk is
needed for config space accesses to the first bus. It makes little sense
to instantiate yet another pcie-designware driver that contains all the
low level setup code, but it is also not justified to add quirks handling
to the generic ECAM driver.
So instead, create a variant of the generic ECAM driver that filters config
space accesses directed at device #1 and up on the first bus.
v3: - use SoC specific compatible strings
- drop MSI patch [for now], since it turns out we may not need it
v2: - use dev->fwnode directly
- replace an instance of pr_err with dev_err, and clarify the error message
- fix Kconfig/Makefile dependency errors reported by kbuild
Cc: Leif Lindholm <leif.lindholm@xxxxxxxxxx>
Cc: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Jingoo Han <jingoohan1@xxxxxxxxx>
Cc: Joao Pinto <Joao.Pinto@xxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Ard Biesheuvel (2):
pci: designware: add driver for DWC controller in ECAM shift mode
dt-bindings: designware: add binding for Designware PCIe in ECAM mode
Documentation/devicetree/bindings/pci/designware-pcie-ecam.txt | 42 +++++++++++
drivers/pci/dwc/Kconfig | 11 +++
drivers/pci/dwc/Makefile | 1 +
drivers/pci/dwc/pcie-designware-ecam.c | 77 ++++++++++++++++++++
4 files changed, 131 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/designware-pcie-ecam.txt
create mode 100644 drivers/pci/dwc/pcie-designware-ecam.c
--
2.11.0
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
